作者:Manuela Weigl、Bernhard Wünsch
DOI:10.1016/j.ejmech.2007.02.005
日期:2007.10
from (S)-glutamate, which was transformed in five reaction steps into the piperazinediones 5 bearing a propionic acid ester side chain. A two-step Dieckmann analogous cyclization provided the bicyclic ketones 7 as key intermediates. The alcohols 8 were prepared by LiAlH4 reduction of the ketones 7. NaBH4 reduction, Williamson ether synthesis and LiAlH4 reduction led to the methyl and benzyl ethers 12
桥连哌嗪4被设计为构象受限的哌嗪sigma受体配体。手性库合成从(S)-谷氨酸开始,其在五个反应步骤中转变成带有丙酸酯侧链的哌嗪二酮5。两步狄克曼类似物环化提供了双环酮7作为关键中间体。通过酮的LiAlH4还原制备醇8。NaBH4还原,Williamson醚合成和LiAlH4还原导致甲基和苄基醚12和13。当在N-8或N-8处引入一个大取代基时,可获得高sigma1亲和力。 O-2。该系列化合物中最有效的sigma1配体是具有N-丁基取代基的甲基醚12b(K(i)= 13.2 nM,选择性sigma2:sigma1 = 16)。此外,N-甲基衍生物13a(σ2:K(i)= 30。